MOBILE, Alabama -- When Kyser Miree cracked open the front door of his midtown home, four men barged inside with three guns pointed as he tumbled to the floor, begging for his life, a prosecutor said this morning.

Miree, a 23-year-old engineer, was home alone. He had chosen to get some sleep before an early morning fishing tournament with his father the next day. Meanwhile, his roommate, another friend and his girlfriend had ventured downtown for some fun that Friday night, April 16, 2010.

"Unbeknownst to these four friends, four other friends were making plans of their own…making plans to rob someone," said Assistant District Attorney Jill Phillips during opening arguments of Michael Lee's capital murder trial. "On that fateful night…the plans of Kyser and his friends tragically intersected with the plans of the defendant's and his friends."

Lee, 21, is on trial on a capital murder charge this week, accused of shooting Miree in the head after demanding money from him.

Three other men -- Ernest Wiggins, Bo Taylor and Jamal Lang -- are also charged with capital murder as Lee's alleged accomplices. They are expected to testify in Lee's trial.

This morning, Phillips gave a narrative of what happened the night Miree died. Miree lived in a house on Macy Place with his friend and co-worker Curtis Wright, and he was dating Wright's sister, Sarah Wright.

On April 16, 2010, another friend and co-worker, Marshall Thompson, drove from his west Mobile home to pick up Curtis Wright to have a drink at the Bike Shop on Dauphin Street downtown. On the way, he stopped at an ATM near Bel Air Mall to get some cash.

Phillips said that quick detour caught the attention of Lee and his accomplices, and they followed Thompson to the Macy Place house.

WHile the four men hid the car nearby, Thompson picked up Wright, who was sitting on the front porch, and they headed downtown.

Phillips, who called Lee the "chief" among the four defendants, said Lee insisted on going forward with the robbery even though they noticed that Thompson's car was already gone.

Kyser was "on the floor, begging and pleading, 'don't shoot me, don't shoot me, I don't have anything,'" Phillips told the 12-woman, 4-man jury. "His pleas were for naught…they left Kyser for dead."

The defense, meanwhile, argued to the jury that evidence indicates the shooting was accidental and a killing was never part of the robbery plan.

"A gun discharged unintentionally in the hands of someone," possibly while attempting to hit Miree with the gun, said defense attorney Art Powell.

"They were all shocked," Powell said, "It wasn't supposed to happen."

Powell said that all three accomplices were pressured to change their original stories -- that the shooting was an accident -- because the prosecution weren't "getting what they want."

He said other witnesses who claim they heard Lee discussing the shooting had their own motivations of getting a cash reward or having criminal charges against them dropped.

Miree's girlfriend, Sarah Wright, was among the first witnesses to testify today. Wright, now a registered nurse, was finishing nursing school at the University of South Alabama and she attended her sorority's final formal party for the year downtown.

When she wanted to go home, she called Miree, she said, but their connection was lost. She said she called several times after that, but never reached him.

She said she then called her brother Curtis, he picked her up, and they drove back to Macy Place to check on Miree.

They found him in a pool of blood, although it wasn't immediately clear that he'd been shot, she said.